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贵州大方地区牛蹄塘组一段富有机质泥页岩孔隙特征研究
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作者 颜雪 赵利 +3 位作者 王磊 鲁霞 王光辉 吕渭玲 《四川地质学报》 2023年第2期258-263,共6页
以扫描电镜、氮气吸附实验为基础,结合物性、TOC、Ro分析对贵州大方地区下寒武统牛蹄塘组一段富有机质泥页岩孔隙类型及特征和甲烷吸附能力的影响因素进行了研究,其结果显示:①富有机质页岩主要为炭质泥岩、炭质含粉砂泥岩、炭质页岩,... 以扫描电镜、氮气吸附实验为基础,结合物性、TOC、Ro分析对贵州大方地区下寒武统牛蹄塘组一段富有机质泥页岩孔隙类型及特征和甲烷吸附能力的影响因素进行了研究,其结果显示:①富有机质页岩主要为炭质泥岩、炭质含粉砂泥岩、炭质页岩,有机质丰度和热演化程度较高,具备较强的生烃潜力;②孔隙类型发育有机质孔和晶间孔、溶蚀孔、铸模孔和微裂缝,有机质孔连通性较好,总体具有低孔一低渗、超低渗型储层特征;③有机碳含量和成熟度升高,有利于有机质孔隙发育,提高甲烷吸附能力。 展开更多
关键词 牛蹄塘组一段 孔隙类型特征 富有机质页岩 大方地区
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黔北大方地区二叠系—三叠系界线粘土及事件粘土地球化学特征及成因 被引量:3
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作者 谭梅 赵兵 +1 位作者 周冰洋 张晓诗 《地质通报》 CAS CSCD 北大核心 2016年第6期979-988,共10页
黔北大方地区二叠纪及三叠纪地层发育,在二叠系—三叠系界线处发现12~14cm厚的界线粘土,在界线粘土层之上还发现3~4层5~18cm厚的火山事件粘土层。二叠系—三叠系界线粘土、事件粘土及松子坎段底部火山事件粘土岩(绿豆岩)均具有高的K_2... 黔北大方地区二叠纪及三叠纪地层发育,在二叠系—三叠系界线处发现12~14cm厚的界线粘土,在界线粘土层之上还发现3~4层5~18cm厚的火山事件粘土层。二叠系—三叠系界线粘土、事件粘土及松子坎段底部火山事件粘土岩(绿豆岩)均具有高的K_2O和MgO含量;二叠系—三叠系界线粘土的稀土元素特征与关岭组松子坎段底部绿豆岩相似,与沙堡湾段事件粘土岩的稀土元素特征也十分相似,Eu异常较明显,说明界线粘土及事件粘土成因均与火山活动有密切关系。界线粘土比事件粘土具更明显的Eu异常,部分界线粘土还具有Ce异常。二叠系—三叠界线粘土、事件粘土及关岭组绿豆岩的源区均属于活动大陆边缘的长英质火山岩区,为酸性的长英质火山岩喷发(火山灰)沉积的产物,而沙堡湾段及九级滩段正常沉积泥岩的源区属于被动大陆边缘的长石砂岩岩区。界线粘土中,大部分微量元素与事件粘土及关岭组绿豆岩中对应微量元素的含量相近,但其中的Th、Y、Nb、Cd、Ga、In、Ta明显高于与火山活动有关的事件粘土及绿豆岩,推测事件粘土与少量宇宙事件外来物质的加入有关。 展开更多
关键词 贵州省 大方地区 二叠系—三叠系界线 界线粘土 事件粘土 地球化学特征
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贵州大方地区二桥组地层特征及沉积相分析 被引量:3
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作者 周冰洋 赵兵 +2 位作者 孙剑 谭梅 张晓诗 《地质学刊》 CAS 2017年第1期46-53,共8页
为研究贵州大方地区晚三叠地层中二桥组岩石地层特征和沉积相,在研究区采集岩石样品进行分析。通过对区内岩石地层的岩性、沉积地球化学分析结果及沉积相的分析,描述了贵州大方地区二桥组地层剖面,并对二桥组的岩性组合特征、接触关系... 为研究贵州大方地区晚三叠地层中二桥组岩石地层特征和沉积相,在研究区采集岩石样品进行分析。通过对区内岩石地层的岩性、沉积地球化学分析结果及沉积相的分析,描述了贵州大方地区二桥组地层剖面,并对二桥组的岩性组合特征、接触关系及横向变化进行对比,分析了该地层岩石特征和沉积相。研究区二桥组主要为一套陆相含植物化石的灰白、黄灰、褐灰色厚层夹薄层岩屑石英砂岩,由于二桥组与上覆及下伏地层均为平行不整合接触,地层厚度在各地差别较大。根据上述数据确定二桥组年代地层为上三叠统—下侏罗统,河流相辫状河-曲流河亚相沉积,地球化学特征显示其物源区的大地构造背景属于被动大陆边缘克拉通盆地。 展开更多
关键词 地层特征 沉积相 二桥组 大方地区 贵州毕节
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贵州大方地区农村已婚妇女生殖道感染现况调查 被引量:1
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作者 王伟 夏曙华 +6 位作者 彭晓风 莫非 谢婷婷 晏家胜 王伟人 杨帆 周旋 《贵州医药》 CAS 2003年第12期1133-1135,共3页
关键词 贵州大方地区 农村 已婚妇女 生殖道感染 现况 调查 流行病学
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贵州大方地区龙潭组煤系地层沉积环境分析 被引量:1
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作者 孙剑 赵兵 《煤炭技术》 CAS 2018年第8期100-102,共3页
通过观察大方地区龙潭组地层的野外特征并结合沉积学的理论知识,对龙潭组含煤地层特征、沉积环境、影响因素及分布规律进行研究,建立了2个龙潭煤系的标志层和3个含煤组,龙潭组沉积相类型主要为沼泽相和海岸相,沼泽相为龙潭组主要的成煤... 通过观察大方地区龙潭组地层的野外特征并结合沉积学的理论知识,对龙潭组含煤地层特征、沉积环境、影响因素及分布规律进行研究,建立了2个龙潭煤系的标志层和3个含煤组,龙潭组沉积相类型主要为沼泽相和海岸相,沼泽相为龙潭组主要的成煤环境。凹陷的古地理环境、频繁的海退海进、古气候和丰富的植被是控制该区龙潭组含煤地层形成的主要原因。受构造和海退海进影响,含煤地层沿NNE向及NE向展布。 展开更多
关键词 沉积环境 煤层 龙潭组 大方地区
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贵州大方地区龙潭组沉积相类型及其特征 被引量:1
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作者 赵利 赵聪 +2 位作者 罗海金 姚华龙 鲁霞 《石油化工应用》 CAS 2019年第4期103-105,117,共4页
贵州大方地区龙潭组发育一套暗色富有机质泥页岩,反映浅水还原沉积环境。结合研究区龙潭组沉积相标志的识别和研究,基本查明了研究区龙潭组的沉积环境为海陆过渡-三角洲沉积体系,发育完整的三角洲平原、三角洲前缘和前三角洲亚相。龙潭... 贵州大方地区龙潭组发育一套暗色富有机质泥页岩,反映浅水还原沉积环境。结合研究区龙潭组沉积相标志的识别和研究,基本查明了研究区龙潭组的沉积环境为海陆过渡-三角洲沉积体系,发育完整的三角洲平原、三角洲前缘和前三角洲亚相。龙潭组富有机质泥页岩的沉积环境及特征表明其具有生油(气)的潜力,可以作为下一步油气勘探的潜在目标层。 展开更多
关键词 大方地区 龙潭组 泥页岩 沉积环境 三角洲相
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贵州大方地区地下水水质质量分析及环境意义 被引量:1
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作者 张晓诗 赵兵 +2 位作者 谭梅 周冰洋 孙剑 《地下水》 2016年第4期3-6,153,共5页
结合贵州1:5万响水等6幅岩溶石山区域地质调查项目,分析黔北大方地区地下水化学特征及水质质量。结果表明:研究区地下水中氟含量低,地下水水质总体良好,但个别碳酸盐岩区氨氮含量高(属Ⅳ类水质)、个别龙潭组煤系地层区地下水硫酸盐含量... 结合贵州1:5万响水等6幅岩溶石山区域地质调查项目,分析黔北大方地区地下水化学特征及水质质量。结果表明:研究区地下水中氟含量低,地下水水质总体良好,但个别碳酸盐岩区氨氮含量高(属Ⅳ类水质)、个别龙潭组煤系地层区地下水硫酸盐含量高p H值低(属Ⅴ类水质)。从地下水水质现状综合评价看,绝大部分地下水水质良好(77.2%)、少量水质较差(9.35%)、极个别水质极差(3.3%)。应加强煤系地层区地下水水质量监测;加强环境保护,减少人为活动对地下水的污染。 展开更多
关键词 贵州 大方地区 地下水 水质量评价 环境保护
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黔北大方地区地下水及地表水化学类型及特征分析 被引量:1
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作者 周冰洋 赵兵 +2 位作者 张晓诗 谭梅 孙剑 《四川建材》 2016年第1期243-245,247,共4页
结合贵州1:5万响水等6幅岩溶石山区域地质调查项目,对黔北大方地区不同地层区、不同类型的地下水及地表水采样分析,探讨其水化学特征。研究区有六种地表水化学成分类型、十种地下水化学成分类型类型主要为HCO_3^--SO_4^(2-)-Ca^(2+),HCO... 结合贵州1:5万响水等6幅岩溶石山区域地质调查项目,对黔北大方地区不同地层区、不同类型的地下水及地表水采样分析,探讨其水化学特征。研究区有六种地表水化学成分类型、十种地下水化学成分类型类型主要为HCO_3^--SO_4^(2-)-Ca^(2+),HCO_3^--Ca^(2+),HCO_3^--Ca^(2+)-Mg^(2+)及HCO_3^--SO_4^(2-)-Ca^(2+)-Mg^(2+)四种类型;地表水及地下水的酸碱性均以弱碱性为主,占地表水的95.45%、占地下水的93.55%;矿化度及总固溶量均小于1000 mg/L,全为淡水;水的硬度以弱硬水为主,占地表水的68.18%,占地下水的58.06%;不同地层岩性区及不同水类型的水化学性质存在一定差异。 展开更多
关键词 贵州省 大方地区 地下水 地表水 化学性质
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面向对象的喀斯特地区石漠化遥感信息提取研究——以贵州省大方地区为例 被引量:8
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作者 周迪 倪忠云 杨振宇 《地质力学学报》 CSCD 2018年第2期263-273,共11页
针对现有基于像素的监督和非监督分类方法在地质环境复杂、地形起伏较大、阴影明显的喀斯特石漠化地区难以满足石漠化信息提取精度要求的问题,采用基于纹理特征数据和地形数据辅助面向对象方法进行喀斯特地区石漠化信息的提取。该方法... 针对现有基于像素的监督和非监督分类方法在地质环境复杂、地形起伏较大、阴影明显的喀斯特石漠化地区难以满足石漠化信息提取精度要求的问题,采用基于纹理特征数据和地形数据辅助面向对象方法进行喀斯特地区石漠化信息的提取。该方法首先依据石漠化分布在TM/ETM+影像面积大小不均匀的特征,利用纹理和地形因子计算最优分割参数进行多尺度分割;然后根据植被覆盖率、岩石裸露率以及坡度因子构建石漠化分级指标;最后参照石漠化分级标准、光谱信息以及纹理特征等建立的分类规则提取喀斯特地区石漠化信息。选取贵州省石漠化严重的大方县时序TM/ETM+影像进行石漠化信息提取试验,结果表明:与基于像素的监督分类和非监督分类方法相比,基于面向对象的分类可以有效地减少因复杂地形导致石漠化信息提取结果 "椒盐化"现象,提取精度明显优于基于像素的监督分类和非监督分类方法。 展开更多
关键词 喀斯特石漠化 面向对象分类 监督分类 非监督分类 信息提取 大方地区
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贵州大方地区二叠系龙潭组沉积相特征 被引量:2
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作者 颜雪 徐文礼 《四川地质学报》 2019年第2期211-214,共4页
以野外剖面、岩心观察描述、薄片和古生物鉴定为依据,结合区域构造-沉积背景,对贵州大方地区上二叠统龙潭组沉积相特征进行研究,确定该地层单元属于三角洲和滨岸沉积环境,识别出三角洲平原、三角洲前缘、前三角洲、潮坪和泻湖等5种沉积... 以野外剖面、岩心观察描述、薄片和古生物鉴定为依据,结合区域构造-沉积背景,对贵州大方地区上二叠统龙潭组沉积相特征进行研究,确定该地层单元属于三角洲和滨岸沉积环境,识别出三角洲平原、三角洲前缘、前三角洲、潮坪和泻湖等5种沉积亚相和众多微相类型。以单井沉积相分析和连井沉积相剖面对比为基础,编制沉积相平面分布图,显示龙潭组中西部为三角洲沉积,东部为滨岸相沉积。 展开更多
关键词 大方地区 沉积相 龙潭组
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Trends in Seasonal Precipitation over China during 1961-2007 被引量:14
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作者 WANG Yi YAN Zhong-Wei 《Atmospheric and Oceanic Science Letters》 2009年第3期165-171,共7页
Trends in six indices of precipitation in China for seasons during 1961-2007 were analyzed based on daily observations at 587 stations. The trends were estimated by using Sen's method with Mann-Kendall's test ... Trends in six indices of precipitation in China for seasons during 1961-2007 were analyzed based on daily observations at 587 stations. The trends were estimated by using Sen's method with Mann-Kendall's test for quantifying the significance. The geographical patterns of trends in the seasonal indices of extremes were similar to those of total precipitation. For winter, both total and extreme precipitation increased over nearly all of China, except for a small part of northern China. Increasing trends in extreme precipitation also occurred at many stations in southwestern China for spring and the midlower reaches of the Yangtze River and southern China for summer. For autumn, precipitation decreased in eastern China, with an increasing length of maximum dry spell, implying a drying tendency for the post-rainy season. Wetting trends have prevailed in most of western China for all seasons. The well-known 'flood in the south and drought in the north' trend exists in eastern China for summer, while a nearly opposite trend pattern exist for spring. 展开更多
关键词 climate trend climate extremes indices PRECIPITATION dry spell China
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Climatology and Trends of High Temperature Extremes across China in Summer 被引量:8
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作者 WEI Ke CHEN Wen 《Atmospheric and Oceanic Science Letters》 2009年第3期153-158,共6页
Based on the daily maximum air temperature data from 300 stations in China from 1958 to 2008, the climatological distribution of the number of days with high temperature extremes (HTEs, maximum temperatures higher th... Based on the daily maximum air temperature data from 300 stations in China from 1958 to 2008, the climatological distribution of the number of days with high temperature extremes (HTEs, maximum temperatures higher than 35℃) are studied with a focus on the long-term trends. Although the number of HTE days display well-defined sandwich spatial structures with significant decreasing trends in central China and increasing trends in northern China and southern China, the authors show that the decrease of HTE days in central China occurs mainly in the early period before the 1980s, and a significant increase of HTE days dominates most of the stations after the 1980s. The authors also reveal that there is a jump-like acceleration in the number of HTE days at most stations across China since the mid 1990s, especially in South China, East China, North China, and northwest China. 展开更多
关键词 high temperature extremes hot days long term trend climate regime
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Cadmium in agricultural soils,vegetables and rice and potential health risk in vicinity of Dabaoshan Mine in Shaoguan,China 被引量:15
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作者 王振兴 胡习邦 +4 位作者 许振成 蔡立梅 王俊能 曾东 洪鸿加 《Journal of Central South University》 SCIE EI CAS 2014年第5期2004-2010,共7页
Soil cadmium(Cd)contamination resulted from mining and smelting is a major environmental concern,and health risk associated with Cd exposure to multi-media through muti-pathway is increasing.Cd concentrations in soils... Soil cadmium(Cd)contamination resulted from mining and smelting is a major environmental concern,and health risk associated with Cd exposure to multi-media through muti-pathway is increasing.Cd concentrations in soils,vegetables and paddy rice were investigated,and potential non-carcinogenic and carcinogenic health risks exposure to Cd were estimated at six villages around the Dabaoshan Mine,South China.A total of 87 soil samples were found to exceed the China's maximum permission level(MPL)for Cd,while the highest value of 4.42 mg/kg was found near irrigation ditch associated with Hengshi River in Xinyi(XY)Village.Cd contents in vegetables and rice exceeded the maximum permissible concentration by more than five times in every village.Cadmium accumulation in plants is in the order of celery>lactuca sativa L>Chinese cabbage>Romaine lettuce>asparagus lettuce>mustard>cabbage mustard>cabbage.The mean hazard quotient(HQ)of all villages is in the range of [5.29,25.75],and the mean values of cancer risk for investigated areas are more than 10 times greater than the USEPA(2009)threshold limit value of 10-4.Moreover,human non-carcinogenic and carcinogenic risks are mainly attributable to paddy rice intake,followed by vegetables intake,soil ingestion,inhalation,and dermal contact.The results indicate that Cd has a huge potential risk on human health for the local residents. 展开更多
关键词 CADMIUM health risk soil pollution VEGETABLES paddy rice dietary intake
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The Freezing Precipitation over the Middle-Lower Reaches of the Yangtze River during February-March 2009
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作者 SUN Jian-Hua ZHAO Si-Xiong 《Atmospheric and Oceanic Science Letters》 2009年第3期177-182,共6页
In this paper, the authors analyze the quasistationary fronts, surface conditions, and atmospheric stratification processes associated with a freezing precipitation event over the middle-lower reaches of the Yangtze R... In this paper, the authors analyze the quasistationary fronts, surface conditions, and atmospheric stratification processes associated with a freezing precipitation event over the middle-lower reaches of the Yangtze River, especially in the Dabie mountain during February-March 2009. The long duration of freezing precipitation was primarily caused by stationary and anomalous synoptic weather patterns, such as a blocking high pressure in the northern branch and a trough in the southern branch of the westerlies, which resulted in the encounter cold air from northern China and warm moisture from the south. The east-west-oriented, quasi-stationary front (or shear line) found in central China was mostly responsible for producing the precipitation. The warm layer and nearsurface frozen layer were located in the lower troposphere along the front zone. Although the warm layer (〉 0℃) existed along the whole front, a surface temperature less than 0℃ appeared only over the lower-middle reaches of the Yangtze River, especially in the Dabie mountain. Therefore, the surface temperature was the main influencing factor, as the freezing precipitation only happened over the Dabie mountain. 展开更多
关键词 freezing precipitation quasi-stationary front STRATIFICATION warm layer
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Application of Interval Newton Method to Solve Nonlinear Equations and Global Optimization
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作者 LI Shuang XU Caijun WANG Xinzhou 《Geo-Spatial Information Science》 2003年第1期24-27,33,共5页
The basic principle of interval arithmetic and the basic algorithm of the interval Newton methods are introduced.The prototype algorithm can not find any zero in an interval that has zero sometimes,that is,it is insta... The basic principle of interval arithmetic and the basic algorithm of the interval Newton methods are introduced.The prototype algorithm can not find any zero in an interval that has zero sometimes,that is,it is instable.So the prototype relaxation procedure is improved in this paper.Additionally,an immediate test of the existence of a solution following branch_and_bound is proposed,which avoids unwanted computations in those intervals that have no solution.The numerical results demonstrat that the improved interval Newton method is superior to prototype algorithm in terms of solution quality,stability and convergent speed. 展开更多
关键词 interval algorithm interval Newton method global optimization
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ENSO cycle and climate anomaly in China 被引量:4
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作者 陈永利 赵永平 +1 位作者 冯俊乔 王凡 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2012年第6期985-1000,共16页
The inter-annual variability of the tropical Pacific Subsurface Ocean Temperature Anomaly (SOTA) and the associated anomalous atmospheric circulation over the Asian North Pacific during the E1 Nifio-Southern Oscilla... The inter-annual variability of the tropical Pacific Subsurface Ocean Temperature Anomaly (SOTA) and the associated anomalous atmospheric circulation over the Asian North Pacific during the E1 Nifio-Southern Oscillation (ENSO) were investigated using National Centers for Environmental Prediction/ National Center for Atmospheric Research (NCEP/NCAR) atmospheric reanalysis data and simple ocean data simulation (SODA). The relationship between the ENSO and the climate of China was revealed. The main results indicated the following: 1) there are two ENSO modes acting on the subsurface tropical Pacific. The first mode is related to the mature phase of ENSO, which mainly appears during winter. The second mode is associated with a transition stage of the ENSO developing or decaying, which mainly occurs during summer; 2) during the mature phase of E1Nifio, the meridionality of the atmosphere in the mid-high latitude increases, the Aleutian low and high pressure ridge over Lake Baikal strengthens, northerly winds prevail in northern China, and precipitation in northern China decreases significantly. The ridge of the Ural High strengthens during the decaying phase of E1 Nifio, as atmospheric circulation is sustained during winter, and the northerly wind anomaly appears in northern China during summer. Due to the ascending branch of the Walker circulation over the western Pacific, the western Pacific Subtropical High becomes weaker, and south-southeasterly winds prevail over southern China. As a result, less rainfall occurs over northern China and more rainfall over the Changjiang River basin and the southwestern and eastern region of Inner Mongolia. The flood disaster that occurred south of Changjiang River can be attributed to this. The La Nifm event causes an opposite, but weaker effect; 3) the ENSO cycle can influence climate anomalies within China via zonal and meridional heat transport. This is known as the "atmospheric-bridge", where the energy anomaly within the tropical Pacific transfers to the mid-high latitude in the northern Pacific through Hadley cells and Rossby waves, and to the western Pacific-eastern Indian Ocean through Walker circulation. This research also discusses the special air-sea boundary processes during the ENSO events in the tropical Pacific, and indicates that the influence of the subsurface water of the tropical Pacific on the atmospheric circulation may be realized through the sea surface temperature anomalies of the mixed water, which contact the atmosphere and transfer the anomalous heat and moisture to the atmosphere directly. Moreover, the reason for the heavy flood within the Changjiang River during the summer of 1998 is reviewed in this paper. 展开更多
关键词 ENSO cycle tropical Pacific Ocean subsurface ocean temperature anomalies INTERANNUALVARIABILITY climate anomaly of China
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Female Leadership and Organizational Climate in a University Institute
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作者 Paula Ponce Lazaro Selene Viridiana Perez Ramirez Silvia Cartujano Escobar Roque Lopez Tarango Crisoforo Alvarez Violante Braian Real Bahena 《Journal of Modern Accounting and Auditing》 2014年第10期1055-1059,共5页
This paper addresses the case of the Professional Institute of the Southern Region (IPRES), an institute of higher education in the State University of Morelos, with the aim of showing the measurement results of org... This paper addresses the case of the Professional Institute of the Southern Region (IPRES), an institute of higher education in the State University of Morelos, with the aim of showing the measurement results of organizational climate before and after the change of the principal to know some internal features and describe the organizational climate of workers' perception in a transition stage; besides, the influence of the current director's leadership is analyzed in the achievement of organizational goals and how the perception of organizational climate or working environment can be affected by female leadership is also dealt with. In Mexico, there are more and more women running various organizations, including those belonging to the field of education, and universities are no exception. On the other hand, the type of leadership being exercised can promote or hinder the proper performance of the institute and may be a factor of distinction and influence the behavior of those who integrate it; therefore, knowing how it works provides feedback about the processes that determine organizational behavior and the working environment. 展开更多
关键词 organizational climate female leadership PERCEPTION leadership styles
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The interactive development of economy in Hebei coastal region and local universities
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作者 Huan Wang Haifang Zhang 《International Journal of Technology Management》 2014年第12期92-93,共2页
This article taking national current affairs decisions as entry points, the theory related to regional economy as basis, analyzes the development relation between regional economy and local universities, thus puts for... This article taking national current affairs decisions as entry points, the theory related to regional economy as basis, analyzes the development relation between regional economy and local universities, thus puts forward countermeasures to achieve the interactive and coordinating development of Hebei coastal regional economy and local universities. 展开更多
关键词 Hebei coastal regional economy local universities interactive development
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Soil Organic Carbon Sequestration Potential in Nectarine Orchards under Different Reclamation Systems
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作者 Yixiang WANG Boqi WENG +3 位作者 Jing YE Chengji WANG Cenwei LIU Yanchun LI 《Agricultural Science & Technology》 CAS 2017年第7期1192-1195,1207,共5页
The Red Soil Hilly Region in South China, where there is a high capacity of carbon(C), and the land use and vegetation cover change greatly, is an important ecological area in the world, and has an important impact on... The Red Soil Hilly Region in South China, where there is a high capacity of carbon(C), and the land use and vegetation cover change greatly, is an important ecological area in the world, and has an important impact on the global carbon cycle and the seasonal fluctuation of atmospheric CO_2. To better evaluate the effects of reclamation systems in orchards converted from grasslands on soil carbon sequestration, we investigated soil organic carbon(SOC) content and stable C isotope(δ^(13)C)composition in three nectarine orchards at Yuchi Experimental Station in South China. Compared with the sloping clean tillage orchard and terraced clean tillage orchard, SOC content in the terraced orchard with grass cover was increased by 14.90% to 38.49%, and 7.40% to 15.33%, respectively. During the 14 years after orchard establishment, the soil organic matter sources influenced both δ^(13)C distribution with depth and carbon replacement. SOC turnover of the upper soil layer in the terraced orchard with grass cover(a mean 63.05% of replacement in the 20 cm after 14 years) was 1.59 and 1.41 times larger than that of the sloping clean tillage orchard and terraced clean tillage orchard under subtropical conditions, respectively. The equilibrium value of soil organic carbon in the three treatments ranged from 16.067 to 25.608 g/kg under the experimental conditions. The equilibrium value of soil organic carbon in the surface layer under grass cover was 54.801 t/hm^2, and the carbon sequestration potential was 24.695 1 t/hm^2. 展开更多
关键词 ORCHARD Soil organic carbon Carbon sequestration potential δ13C
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